1. Marinate the meat with all the ingredients, except milk,salt, sugar , chopped onion, oil and maowa/khoya for at least 8 hours.

2. Now heat the oil and add the chopped onion..Fry until golden brown. Add the meat with marinade…
Cook very well adding water little by little…That is what we call “Koshano” in Bangla. It should be cooked like this for at least 1 hour.

2.Place the pot on the oven on a medium flame..Cover the lid and let the water come out from the meat..Cook very well adding water little by little for atleast 45 minutes to 1 hour . That is what we call “Koshano” in Bangla.

3. After “Koshano” , when the water is almost dried out add the potatoes and let them cook for few minutes too..Add water covering the potato and the meat…

4.When the gravy thickens and almost drying out add 1 cup regular milk , 1/2 cup heavy cream, and 1 and 1/2 teaspoon sugar…Let them cook until the desired gravy appears…Give handful of green chilies. Add the special garam masala powder at the end of the cooking…Cover the lid until u serve.